It does because for one you can go to court. If a company stops playing nice because they think you’re defrauding them if you tell them your package went missing during transit, company niceness doesn’t get you anything. (That’s a random example btw, I don’t know how this is handled legally in the US. The point is that there are situations where you actually want the law on your side).

You don’t have to go to court even - there is usually a regulatory body that will enforce these for you. This is the whole reason why there is an image of America as sue-happy: they have chosen a regulatory system of “so sue them” instead of a functioning consumer protection system (or any authority with the ability to enforce the ADA, for example).

Suing people and companies is a national pastime in America. I really don't think the EU has an advantage there...